FlowMapp - FlowMapp is a UX planning tool for creating visual sitemaps and user flow.
Pingdom - With website monitoring from Pingdom you will be the first to know when your website is down. No installation required. 30-day free trial.
DYNO Mapper - Create Sitemaps with the DYNO Mapper Visual Sitemap Generator.
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
Octopus.do - Build your website structure in real-time and rapidly share it to collaborate with your team or clients. Start prototyping websites or apps instantly.
Better Uptime - We call you when your website goes down